Adding <st> into a macro works here too.
EX: /ac "Cure" <st>
That will let you choose a target to cure before the rest of the macro fires off. As for <r>, that probably lets you do something like let you tell someone the name of the last person you sent a tell to without typing out the full name. It may even be of use for party invites or other things assuming SE fixes those options later...
A suggestion might be something like this.
/p Gather together, casting Stoneskin!
/ac "Stoneskin" <st>
/p Casting Stoneskin.
Using that it would tell the party you're gonna cast Stoneskin and for them to gather near. It then proceeds to activate the AoE for the spell and then pauses the script until you select a target. Basically with this you can pause it until everyone is in range. Soon as they are, select yourself or another party member, confirm the target, and the rest plays. Finally it ends the effect by turning off the AoE radius. There may be some tweaking involved as I'm not sure if a spell's AoE status can be toggled on or off during casting but I'm assuming it can't. Whatever you have it set to before you start casting should remain to the end.
Edited, Oct 3rd 2010 10:53pm by SamusKnight
FINAL FANTASY XIV Roleplayer
Sair Gammonari - Hyur Midlander Male - Conjurer (Somewhat retired.)
Mihana Zhralyia - Miqo'te Seeker of the Sun Female - Archer